You'll need the Brand name and model number. Then you can Google the company's name ,go to their website and maybe they'll sell you a replacement transmitter. Some companies do sell replacement parts, some don't.

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Related Questions:

Disarming an Armed System/Silencing an Alarm
If system arming has been requested by the keyless entry transmitter, it must be disarmed.
Important: Using the power door unlock switch or manually unlocking the doors does not disable the CTD armed mode. Also, disconnecting the battery or pulling fuses does not disable the armed mode, since the BCM stores the CTD mode status in memory.
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To disarm the CTD system in arm pending mode, SECURITY indicator flashing and doors open, perform 1 of the following:

Since you lost power your "fob" and receiver may not be communicating any more.

This is a process to for your fob to re-sync with your car.

Note : All transmitters being serviced must be available. If the learning process is carried out without having all the transmitters present, all previous transmitter codes will be overwritten, rendering the missing transmitters inoperable.

Sounds like the garage transmitter is bad. The system polls it's transmitters every 2 - 3 minutes. If the received does not get it's proper response it is supposed to inform you by beeping. Also, if the transmitter has a built-in tamper switch it could not be making the required contact. Usually it is the transmitter. Hope this helps

I have Prolink 900 MHz wireless loudspeakers, probably the same as yours. The transmitter is labelled on the bottom as "CAN 2579 102 1811, UNI-ART PRECISE PRODUCTS LTD". That transmitter comes with an AC/DC adapter whose output is labelled as 12VDC, 300mA, with polarity positive outside, negative inside. Note this polarity is the OPPOSITE of what is typical for AC adapters.

If your front door is using a wireless transmitter then the problem is most likely a mis-aligned contact. Most alarm installers will install the transmitter with built in contact on the door molding and a small magnet on the door itself. There is generally an alignment mark on the transmitter case so you know where to place the magnet. The magnet should never be placed more than 1/2 inch away from the transmitter. Be sure the alignment is correct as well as within the spacing requirements. If this was done properly another possibility is either a defective contact or in some cases a loose fitting door with excessive free play could also be causing you a problem. Make sure the door is tight when closed. If your door contact/transmitter is of a different design such as an external contact wired to the transmitter let me know the specifics (type of contact ie., hidden press fit, plunger, surface mount) and I'll give you additional information regarding what to look for. I have over 30 years experience in the alarm business and am sure I can help you.

If your door is protected by a wireless transmitter your problem is most likely a defective switch or a grounded wire from the switch to the transmitter. To determine if the transmitter is working properly pop off the top of transmitter case by using a small blade screwdriver. If you look on the side of the casing you will see a small slot where the screwdriver is placed. Insert the blade of the screwdriver there and twist. The top of the transmitter will release. Inside you will see a small circuit board and battery. If an external switch is used you will also see 2 wires connected to the circuit board which then leads to the swtch. Using a very small screwdriver remove these wires. Now go check system status at your keypad. If the system recognizes the door as open then your problem is a bad switch or pinched wires that are grounding out the switch. If the keypad's status says the door is still closed the problem is in the transmitter. Sometimes these transmitters will be installed using an internal contact/switch.To know if this is the case on your door you will see only the transmitter mounted on or next to the door and a small magnet within a half inch or so on the opposing side. If this is the case your problem again is the internal switch. For replacement of external switches you can try going to a Radio Shack where they offer an assortment. Hope this helps.